MACS J0647.7+7015 is a
galaxy cluster with a
redshift
In physics, a redshift is an increase in the wavelength, and corresponding decrease in the frequency and photon energy, of electromagnetic radiation (such as light). The opposite change, a decrease in wavelength and simultaneous increase in f ...
''z'' = 0.592, located at
J2000.0
In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity. It is useful for the celestial coordinates or orbital elements of a celestial body, as they are subject to pertu ...
right ascension
Right ascension (abbreviated RA; symbol ) is the angular distance of a particular point measured eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point in question above the earth.
When paired w ...
declination
In astronomy, declination (abbreviated dec; symbol ''δ'') is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. Declination's angle is measured north or south of the ...
. It lies between the
Big Dipper and
Little Dipper in the constellation
Camelopardalis
Camelopardalis is a large but faint constellation of the northern sky representing a giraffe. The constellation was introduced in 1612 or 1613 by Petrus Plancius. Some older astronomy books give Camelopardalus or Camelopardus as alternative for ...
. It is part of a sample of 12 extreme galaxy clusters at ''z'' > 0.5 discovered by the
MAssive Cluster Survey (MACS).
During 2012 the galaxy cluster was announced as
gravitationally lensing the most distant
galaxy
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...
(
MACS0647-JD
__NOTOC__
MACS0647-JD is a galaxy with a redshift of about ''z'' = 10.7, equivalent to a light travel distance of 13.26 billion light-years (4 billion parsecs). If the distance estimate is correct, it formed about 427 million years after the Big B ...
), then ever imaged (''z'' = 11).
[NASA Hubblesite]
NASA Great Observatories Find Candidate for Most Distant Galaxy Yet Known
/ref>
References
External links
*
Galaxy clusters
Camelopardalis (constellation)
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